Remove GITLAB_LB_CONFIGURE_CONNECTION feature flag
What does this MR do and why?
The connection pool size reconfigure was moved to load balancer setup. This is safe and we can remove the legacy code.
Follow-up: !72989 (merged).
Related-to: #333411 (closed).
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Kamil Trzciński (Back 2025-01-01)